Quick Fix: WordPress / Elementor Background Image Scaling Issue

I have a simple, one-page WordPress site built using the free version of Elementor. It features a game title and a mailing list subscription field. The Task: I need my large background image to scale dynamically when the browser window is resized. It should scale horizontally to always fit the screen width, and scale proportionally vertically (with the page scrolling vertically as normal). This must be fully responsive across mobile, tablet, and desktop. Requirements: Fix this layout/CSS issue quickly. Work with the Free version of Elementor (no premium plugins). Clean code execution (no messy workarounds). This is a fast $5 fix for an experienced developer, but I am looking for a reliable go-to person for future feature updates on this site. Please apply if you can fix this right away!